Cahn, J. (2012). The harbinger: The ancient mystery that holds the secret of america's future (Unabridged.). Frontline.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCahn, Jonathan. The Harbinger: The Ancient Mystery That Holds the Secret of America's Future. Unabridged. Escondido: Frontline, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCahn, Jonathan. The Harbinger: The Ancient Mystery That Holds the Secret of America's Future. Unabridged. Frontline, 2012.
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